pvp Unleashed Lighting worth it?

So lava burst crits are stronger than lighting bolt, and in pvp a split second can win or lose the fight. Since blizz took out the macro that allowed you to stopcasting unless channeling that spell out, I find ita pain that I cat stop a lighting bolt for a lava burst. Your thinking why not stopcasting cast lava burst, because when you pop asendance you then can't spam it. With the upgrades to our kiting is it needed? There are a few awesome glyphs to change in. Any thoughts?